1. Jpa的使用
1.1 pom.xml
1 <?xml version="1.0" encoding="UTF-8"?> 2 <project xmlns="http://maven.apache.org/POM/4.0.0" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 5 <modelVersion>4.0.0</modelVersion> 6 7 <groupId>com.springdataJpa</groupId> 8 <artifactId>springdataJpa</artifactId> 9 <packaging>pom</packaging> 10 <version>1.0-SNAPSHOT</version> 11 <modules> 12 <module>jdbcTemplate</module> 13 <module>jpa</module> 14 </modules> 15 16 <!-- Spring boot 父引用--> 17 <parent> 18 <groupId>org.springframework.boot</groupId> 19 <artifactId>spring-boot-starter-parent</artifactId> 20 <version>1.4.1.RELEASE</version> 21 </parent> 22 23 <dependencies> 24 <!-- Spring boot 核心web--> 25 <dependency> 26 <groupId>org.springframework.boot</groupId> 27 <artifactId>spring-boot-starter-web</artifactId> 28 </dependency> 29 <dependency> 30 <groupId>org.springframework.boot</groupId> 31 <artifactId>spring-boot-starter-data-jpa</artifactId> 32 </dependency> 33 <dependency> 34 <groupId>org.projectlombok</groupId> 35 <artifactId>lombok</artifactId> 36 <version>1.16.18</version> 37 </dependency> 38 <dependency> 39 <groupId>com.alibaba</groupId> 40 <artifactId>fastjson</artifactId> 41 <version>1.2.29</version> 42 </dependency> 43 <dependency> 44 <groupId>org.springframework.boot</groupId> 45 <artifactId>spring-boot-starter-logging</artifactId> 46 </dependency> 47 <dependency> 48 <groupId>org.springframework.boot</groupId> 49 <artifactId>spring-boot-starter-test</artifactId> 50 </dependency> 51 <dependency> 52 <groupId>com.oracle</groupId> 53 <artifactId>ojdbc14</artifactId> 54 <version>10.2.0.4.0</version> 55 </dependency> 56 <!--<dependency> 57 <groupId>mysql</groupId> 58 <artifactId>mysql-connector-java</artifactId> 59 </dependency>--> 60 </dependencies> 61 62 <build> 63 <plugins> 64 <plugin> 65 <groupId>org.springframework.boot</groupId> 66 <artifactId>spring-boot-maven-plugin</artifactId> 67 <executions> 68 <execution> 69 <goals> 70 <goal>repackage</goal> 71 </goals> 72 </execution> 73 </executions> 74 <configuration> 75 <executable>true</executable> 76 </configuration> 77 </plugin> 78 </plugins> 79 </build> 80 </project>
1.2 application.properties
1 server.port=8089 2 server.servlet-path=/ 3 spring.resources.static-locations=classpath:/static/,classpath:/templates/ 4 spring.mvc.view.suffix=.html 5 6 #配置数据源 7 #mysql 8 #spring.datasource.driver-class-name=com.mysql.jdbc.Driver 9 #spring.datasource.url=jdbc:mysql://localhost:3306/jpa 10 #spring.datasource.username=root 11 #spring.datasource.password=root 12 13 #oracle 14 spring.datasource.driver-class-name=oracle.jdbc.driver.OracleDriver 15 spring.datasource.url=jdbc:oracle:thin:@localhost:1521:orcl 16 spring.datasource.username=scott 17 spring.datasource.password=scott 18 19 spring.jpa.hibernate.ddl-auto=update 20 21 spring.jpa.properties.hibernate.hbm2ddl.auto=update 22 spring.jpa.show-sql=true 23 ##懒加载默认就为true 24 spring.jpa.open-in-view=true 25 26 #在控制台输出彩色日志 27 spring.output.ansi.enabled=always
1.3 model
1.3.1 BaseDomain.class
1 package com.springdatajpa.model.base; 2 3 import com.alibaba.fastjson.annotation.JSONField; 4 5 import javax.persistence.Column; 6 import javax.persistence.MappedSuperclass; 7 import javax.persistence.PrePersist; 8 import javax.persistence.PreUpdate; 9 import java.io.Serializable; 10 import java.util.Date; 11 12 /** 13 * @date 2018/7/30 14 */ 15 @MappedSuperclass 16 abstract public class BaseDomain implements Serializable { 17 18 /** 19 * 创建日期 20 */ 21 @Column(name = "date_created") 22 @JSONField(format = "yyyy-MM-dd HH:mm:ss") 23 private Date dateCreated; 24 25 /** 26 * 最后更新日期 27 */ 28 @Column(name = "last_updated") 29 @JSONField(format = "yyyy-MM-dd HH:mm:ss") 30 private Date lastUpdated; 31 32 @Column(name = "version") 33 private Integer version; 34 35 @Column(name = "is_delete") 36 private Boolean isDelete = false; 37 38 @JSONField(format = "yyyy-MM-dd HH:mm:ss") 39 private Date deleteDate; 40 41 public Date getDateCreated() { 42 return dateCreated; 43 } 44 45 public void setDateCreated(Date dateCreated) { 46 this.dateCreated = dateCreated; 47 } 48 49 public Date getLastUpdated() { 50 return lastUpdated; 51 } 52 53 public void setLastUpdated(Date lastUpdated) { 54 this.lastUpdated = lastUpdated; 55 } 56 57 public Integer getVersion() { 58 return version; 59 } 60 61 public void setVersion(Integer version) { 62 this.version = version; 63 } 64 65 public Boolean getIsDelete() { 66 return isDelete; 67 } 68 69 public void setIsDelete(Boolean isDelete) { 70 if (isDelete != null && isDelete) { 71 this.deleteDate = new Date(); 72 } 73 this.isDelete = isDelete; 74 } 75 76 @PrePersist 77 protected void prePersist() { 78 dateCreated = new Date(); 79 version = 1; 80 } 81 82 83 @PreUpdate 84 private void preUpdate() { 85 lastUpdated = new Date(); 86 if (version == null) { 87 version = 1; 88 } else { 89 version++; 90 } 91 } 92 }
1.3.2 Student.class
1 package com.springdatajpa.model; 2 3 import com.springdatajpa.model.base.BaseDomain; 4 import lombok.Data; 5 import org.hibernate.annotations.GenericGenerator; 6 7 import javax.persistence.*; 8 import java.io.Serializable; 9 import java.util.List; 10 11 /** 12 * @date 2018/7/30 13 */ 14 @Entity 15 @Data 16 public class Student extends BaseDomain implements Serializable { 17 /** 18 * 主键. 19 */ 20 @Id 21 @GenericGenerator(name = "PKUUID", strategy = "uuid2") 22 @GeneratedValue(generator = "PKUUID") 23 private String id; 24 /** 25 * 姓名. 26 */ 27 private String name; 28 /** 29 * 编号. 30 */ 31 private String studentNo; 32 /** 33 * 年龄 34 */ 35 private Integer age; 36 37 /** 38 * 地址列表 39 */ 40 @OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL, mappedBy = "student") 41 private List<Address> addresses; 42 43 }
1.3.3 Address.class
1 package com.springdatajpa.model; 2 3 import com.springdatajpa.model.base.BaseDomain; 4 import lombok.Data; 5 import org.hibernate.annotations.GenericGenerator; 6 7 import javax.persistence.*; 8 import java.io.Serializable; 9 10 /** 11 * @author12 * @date 2018/7/30 13 */ 14 @Entity 15 @Data 16 public class Address extends BaseDomain implements Serializable { 17 /** 18 * 主键. 19 */ 20 @Id 21 @GenericGenerator(name = "PKUUID", strategy = "uuid2") 22 @GeneratedValue(generator = "PKUUID") 23 private String id; 24 /** 25 * 地址 26 */ 27 private String addressDetail; 28 /** 29 * 学生id. 30 */ 31 @ManyToOne 32 @JoinColumn(name = "STUDENT_ID", foreignKey = @ForeignKey(name = "FK_STUDENT_ADDRESS")) 33 private Student student; 34 35 }
1.4 repository
1.4.1 StudentRepo.class
1 package com.springdatajpa.repository; 2 3 import com.springdatajpa.model.Student; 4 import org.springframework.data.jpa.repository.JpaRepository; 5 import org.springframework.data.jpa.repository.JpaSpecificationExecutor; 6 import org.springframework.data.repository.CrudRepository; 7 8 /** 9 * @author10 * @date 2018/7/30 11 */ 12 public interface StudentRepo extends JpaRepository<Student,String>,JpaSpecificationExecutor<Student> { 13 14 Student findById(String id); 15 }
1.4.2 AddressRepo.class
1 package com.springdatajpa.repository; 2 3 import com.springdatajpa.model.Address; 4 import org.springframework.data.jpa.repository.JpaRepository; 5 import org.springframework.data.jpa.repository.JpaSpecificationExecutor; 6 7 /** 8 * @author 9 * @date 2018/7/30 10 */ 11 public interface AddressRepo extends JpaRepository<Address,String>,JpaSpecificationExecutor<Address> { 12 Address findById(String id); 13 }
1.5 specification
1.5.1 StudentSpecification.class
1 package com.springdatajpa.specification; 2 3 import com.springdatajpa.dto.StudentQuery; 4 import org.springframework.data.jpa.domain.Specification; 5 import org.springframework.util.StringUtils; 6 7 import javax.persistence.criteria.CriteriaBuilder; 8 import javax.persistence.criteria.CriteriaQuery; 9 import javax.persistence.criteria.Predicate; 10 import javax.persistence.criteria.Root; 11 import java.util.ArrayList; 12 import java.util.List; 13 14 /** 15 * @author16 * @date 2018/7/30 17 */ 18 public class StudentSpecification<T> implements Specification<T> { 19 private StudentQuery studentQuery; 20 21 public StudentSpecification() { 22 } 23 24 public StudentSpecification(StudentQuery studentQuery) { 25 this.studentQuery = studentQuery; 26 } 27 28 @Override 29 public Predicate toPredicate(Root<T> root, CriteriaQuery<?> query, CriteriaBuilder cb) { 30 List<Predicate> predicates = new ArrayList<>(); 31 predicates.add(cb.equal(root.get("isDelete"), false)); 32 if (!StringUtils.isEmpty(studentQuery.getName()) && !studentQuery.getName().isEmpty()) { 33 predicates.add(cb.equal(root.get("name"), studentQuery.getName())); 34 } 35 if (!StringUtils.isEmpty(studentQuery.getAge()) && !studentQuery.getAge().isEmpty()) { 36 predicates.add(cb.equal(root.get("age"), studentQuery.getAge())); 37 } 38 if (!StringUtils.isEmpty(studentQuery.getStudentNo()) && !studentQuery.getStudentNo().isEmpty()) { 39 predicates.add(cb.equal(root.get("studentNo"), studentQuery.getStudentNo())); 40 } 41 if (studentQuery.getStartTime() != null) { 42 predicates.add(cb.greaterThanOrEqualTo(root.get("dateCreated"), studentQuery.getStartTime())); 43 } 44 if (studentQuery.getEndTime() != null) { 45 predicates.add(cb.lessThanOrEqualTo(root.get("dateCreated"), studentQuery.getEndTime())); 46 } 47 return query.where(predicates.toArray(new Predicate[predicates.size()])).getRestriction(); 48 } 49 }